Enabling gobject-introspection support in gtk3 builds

[Rene Engelhard]

> So I think one wants to change
> 
>              --library=libreofficekitgtk --library-path="${INSTALLDIR}/program/libreofficekitgtk" \
> 
> into
> 
>              --library=libreofficekitgtk --library-path="${DESTDIR}/${INSTALLDIR}/program/libreofficekitgtk" \

Of course I meant

--library=libreofficekitgtk --library-path="${DESTDIR}/${INSTALLDIR}/program" \

here...

Regards,

Rene